* Speed: How fast something is moving. It's usually measured in units like meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).

* Constant: Staying the same, unchanging.

Example:

Imagine a car driving on a highway. If the car's speedometer shows a steady 60 mph, that means it's moving at a constant speed.

Important Note: Constant speed doesn't necessarily mean constant velocity. Velocity also considers direction. A car moving at a constant speed in a circle is not moving at a constant velocity because its direction is constantly changing.